Analysis of the change of spillway flow edge and the rationality of slope protection height based on numerical simulation
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Abstract:
The spillway is an important structure to ensure the safe discharge of the reservoir and the safe operation of the dam body. In order to ensure the safe operation of the spillway, the hydraulic characteristics of the spillway of the Goushuipo Reservoir reinforcement project were tested and studied, and the engineering design was validated and optimized. Based on SolidWorks software, the three-dimensional numerical model of the spillway of the Goushuipo Reservoir was established by the VOF method, and the closed N-S equation of RNG k-εturbulence model were used to simulate the spillway of the Goushuipo Reservoir reinforcement project by Fluent software. Based on the conditions of 30-year flood and 50-year flood, the data of spillway water surface line simulated by mathematical model was slightly different from that measured by physical model only in the silting pool, and the maximum deviation of water surface line was 9.2%. Using numerical simulation method to correct and simulate the original design scheme had higher simulation accuracy and reliability.The relation function of water level and discharge was established, and the variation law of water flow along the spillway was analyzed. Under the design conditions, the flood level of the stilling pool and the tail channel of the reservoir exceeded the top of the slope protection. The reason why the concrete slope protection height of the spillway could not meet the normal flood discharge under the 30-year flood condition of the Goushuipo reservoir reinforcement project was deeply analyzed. An optimization scheme was proposed to set two-stage water mat in the slope section of the reservoir, increase the slope protection height of the silencing pool section and shorten the length of the tail channel. The numerical simulation results showed that the rhomboid flow in the slope section of the spillway was destroyed, and the discharging energy of part of the flow was reduced. After the flood enters the silencing pool, the rolling degree of the flow was weakened, the flow state was relatively stable, and the energy dissipation effect was remarkable. The water surface line of steep slope section, stilling pool and sea section of bend did not exceed the top of slope protection. Based on the optimization scheme, the problem that the slope protection height of spillway can not discharge floodwater normally under the design condition was solved, and the scheme provided a reference for engineering optimization design.Through comparison and analysis of the numerical simulation results of the spillway of Goushuipo reservoir with the physical model test results, the numerical simulation method have high accuracy and reliability, and the numerical simulation method can be used to study and analyze the hydraulic characteristics of the spillway along the water surface elevation, flow velocity and flow pattern, pressure, discharge, and energy dissipation and erosion evolution law and to optimize the spillway structure in a targeted manner. The relationship function of water level and discharge obtained by fitting analysis provides a reference for design and operation. The research results provide technical support for numerical simulation of similar spillway projects.
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